As far as Krakow goes, you can find better locations. Also be warned that this hostel is apparently popular with larger groups, at least while I was staying here. Nice, big kitchen and free coffee/tea whenever you want!

Great location for a first visit, since the hostel is only a few minutes from the main Sultanahmet attractions. Staff was incredibly nice and helpful; hostel was extremely clean. It has a nice atmosphere, with a common room on the top floor, which has a great view of the water. Not a party place, but has a nice, friendly vibe.

A comfortable, well located hostel. Staff were extremely kind and helpful. Nothing too special though, and while I was perfectly happy here for the weekend, I'd probably try somewhere else if I found myself back in Warszawa.